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d.innerHTML = d.innerHTML + '<a class=\"download_word download_word_lb\" href=\"javascript:;\" id=\"vipdown\" onclick=\"fdownpc(553,3466489,2,\'newstext\')\"><div class=\"download_card\"><div class=\"card_nr card_nr_lb\"><h4 class=\"card_bt\">三、四边形</h4><div class=\"download_card_msg\">三、四边形知识点：1、四边形：有四条直的边围成的封闭图形叫四边形。2、重点是理解周长的概念，会计算长方形和正方形的周长。周长：封闭图形一周的长度，就是它的周长。长方形周长＝长＋长＋宽＋宽＝长×2＋宽×2＝（长＋宽）×2正方形周长＝边长＋边长。下面小编给大家分享三、四边形，希望能帮助到大家。 三、四边形文档下载网址链接：</div></div><div class=\"download_card_btn download_card_btn_lb\"><div class=\"content_box_tj\"><span>推荐度：</span><img src=\"/skin/zhann/images/icon_star.png\" alt=\"\">	<img src=\"/skin/zhann/images/icon_star.png\" alt=\"\">	<img src=\"/skin/zhann/images/icon_star.png\" alt=\"\">	<img src=\"/skin/zhann/images/icon_star.png\" alt=\"\"></div><div class=\"downlod_btn_right demo_tc downlod_btn_right_lb\"><em class=\"downlod_icon\"></em>点击下载文档<span>文档为doc格式</span></div> </div></div></a>';
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